Honeywell H46D Installation Guide
H46D Humidity Controller
INSTALLATION INSTRUCTIONS
APPLICATION
The H46D Humidity Controller is used with portable and
central unit humidifiers. The H46 has an spst, snap-acting
switch designed for line or low voltage circuits and two
leadwires for switch box mounting.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Disconnect power supply before connecting wiring
to avoid electrical shock or equipment damage.
Location
Select a location about 5 ft (1.5m) above the floor in an
area with good circulation at average temperature and
humidity for the area to be controlled. Avoid locations near
hot or cold air ducts and discharge air from the controlled
equipment.
Mounting
쐃 Remove the setting knob.
쐇 Pull the cover forward from the device to remove.
쐋 Install a 2 x 3 in. (51 mm x 76 mm) vertical switch
box at the selected location.
쐏 Using the two screws provided, fasten the adapter
plate to the switch box as shown. See Fig. 1.
쐄 Pull the wires from the switch box through the
opening in the adapter plate and connect to the H46
leadwires with the solderless connectors provided.
See Fig. 2 through 4 for typical hookup.
쐂 Push the wires back into the switch box.
쐆 Place the H46 against the adapter plate, making
certain the tab at the bottom of the plate fits into the
notch on the H46.
쐊 Fasten the H46 to the adapter plate by tightening
the captive screw.
쐎 Replace the cover and the setting knob.
2 X 3 IN.
ADAPTER PLATE
SCREWS (2)
H46 CAPTIVE
MOUNTING SCREW
H46
(COVER OFF)
NYLON
ELEMENT
Fig. 1. Mounting H46D on vertical switch box.
SWITCH BOX
ADAPTER PLATE
PLATE TAB
H46 LEADWIRES (2)
WALL SURFACE
M7907
Wiring
Disconnect power supply before connecting wiring to avoid
electrical shock or equipment damage. All wiring must
comply with local codes and ordinances. Do not exceed
contact and coil ratings when wiring into the system.
See Fig. 2.
®U.S. Registered Trademark
Copyright © 1996 Honeywell Inc. • All Rights Reserved
X-XX UL
69-1001B
H46D HUMIDITY CONTROLLER
FAN
CONTROLLER
TEMPERATURE
RISE
FAN MOTOR
L1
(HOT)
L2
POWER
1
SUPPLY
PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
Fig. 2. Typical wiring diagram for H46D single-speed
FAN CONTROL
FAN MOTOR
LO
C
PROVIDE DISCONNECT MEANS AND
1
OVERLOAD PROTECTION AS REQUIRED.
2
TO ENSURE HUMIDIFIER OPERATION
IN WINTER WHEN THERMOSTAT
SUBBASE FAN SWITCH IS AT ON OR
AUTO, ADD SAIL SWITCH TO SYSTEM
AS SHOWN.
TO PREVENT HUMIDIFIER OPERATION
3
IN SUMMER, TURN H46D KNOB
TO OFF POSITION.
L4068
HI
H46D
CONTROLLER
fan motor.
COOLING
RELAY R8230
HUMIDITY
FALL
SAIL
SWITCH
S688A
H46D
HUMIDITY
CONTROL
HUMIDIFIER
MOTOR
HUMIDIFIER
M7910
2
3
L1 (HOT)
POWER
SUPPLY
1
HUMIDITY
FALL
M7911
H46D
HUMIDITY
FALL
RA89A RELAY
TT
TRANSFORMER
JUMPER
REMOVED
21 3
FAN
MOTOR
FAN
CONTROL
L1
(HOT)
L2
L2
POWER
SUPPLY
PROVIDE DISCONNECT MEANS AND OVERLOAD
1
PROTECTION AS REQUIRED.
Fig. 4. Typical wiring diagram for H46D with a
1
switching relay.
L1
(HOT)
POWER
SUPPLY
RELAY
4
L2
1
SETTING AND ADJUSTMENT
The H46 makes contact on a relative humidity fall to the
set point to start the humidifier. On an increase in relative
humidity to the set point (plus the differential), the switch
breaks contact to stop the humidifier. Turn the knob
clockwise to the setting stop to place the H46 in the ON
position. Turn the knob counterclockwise to the setting
stop to place the H46 in the OFF position.
HUMIDIFIER
M7912
Fig. 3. Typical wiring diagram for H46D in forced air
Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
system with 2-speed fan motor.
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
CHECKOUT
After all mounting and wlring is completed, turn on the
power supply. Place the system into operation by turning
the setting knob toward the high end of the scale until the
humidifier motor starts (on central unit humidifier systems,
the furnace fan must be running before the humidifier
starts). Turn the setting knob slowly toward the low end of
the scale until the humidifier motor stops.
Helping You Control Your World
M2H 2C9
69-1001B
69-1001B J.S. 4-96 Printed in Taiwan R.O.C www.honeywell.com/yourhome.
2
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